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1. As part of a promotion for a new type of cracker, free samples are offered to shoppers in a local supermarket. The probability that a shopper will buy a packet of crackers after tasting the free sample is 0.200. Different shoppers can be regarded as independent trials. Let be the proportion of the next n shoppers that buy a packet of the crackers after tasting a free sample. How large should n be so that the standard deviation of is no more than 0.01?
A. 4B. 16C. 1600
2. Suppose that the random variable X has a distribution with a density curve that looks like the following.
The sampling distribution of the mean of a random sample of 100 observations from this distribution will have a density curve that looks most like which of the following?
A.
B.
C.
Determine the probability that their SAT scores will differ by more than 50 points?
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Explain the differences between longitudinal and cross sectional business research studies. Which two types of probability sampling are best suited for business research and statistical data analysis, and why?
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Generate a 95% confidence interval for the difference in mean HDL levels between men when exercise regularly and those who do not.
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Survey was mailed to a total of 400 students; 100 were randomly selected from each of the freshman, sophomore, junior and senior classes last semester. What sampling method was used?
I have fit a line to data representing cholesterol readings for 28 individuals starting a cholesterol reducing drug. The computer provides the following output, The degrees of freedom for the t test for the slope are
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Describe the difference in the determination of a confidence interval of a normal distribution if the variance is known or unknown.
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